It's not a close risk comparison. The world is far less dangerous today than it has ever been, that includes both terrorism and war. AI and autonomous weapons systems are not going to suddenly make the developed countries that deploy those weapons want to slaughter each other.

How many people die from medical mistakes per year in the US? More than died in all wars and all acts of terrorism combined globally in 2015. The AI that is no doubt going to show up throughout healthcare over the coming 30 or 40 years, will probably improve on the rate of human mistakes - while it still kills tens of thousands per year through mistakes in just the US.